The U.S. Environmental Protection Agency is requesting nominations of chemical and microbial contaminants that are not currently regulated for possible inclusion on the fifth drinking water Contaminant Candidate List.

The EPA requests that nominations include information showing the nominated contaminant is known or anticipated to occur in public water systems and that the nominated contaminant may require regulation due to the potential for adverse effects on the health of persons. According to the EPA, 78 percent of public water systems rely on groundwater.

Nominations must be received by December 4. Click here for more information from the Federal Register.